Hugh Hefner insists the porn in Playboy magazine is so innocent "you could show it to your grandma".

The 79-year-old believes his titillating title has been unfairly judged by critics who have no idea about its contents.

He says, "We deal with sexuality in a way that is remarkably innocent; things you could show to your grandma. We don't have any hardcore. No male or female couplings. Not that any of that is bad. It only gets bad when you do something that is truly demeaning: when it implies violence."